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    <script>
        const student = {
            name: '小雅',
            age: 19,
            // 对象的方法定义箭头函数不适合
            showInfo: () => {
                setTimeout(() => {
                console.log('我叫' + this.name + '我今年' + this.age + '岁');
                }, 1000);
            }
        }
        // 1 秒后控制台输出：我叫我今年 undefined 岁
        student.showInfo();
        </script>
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